The aircraft engine driven(IDG) and APU generators are rated at?
The engine driven (IDG) generators have an
Overload rating of?
45 KVA for 5 minutes
60 KVA for 5 seconds
The main aircraft generators supply power to how many AC buses?
Power for the 28v DC systems is supplied by?
(Transformer Rectifier Units)
The APU battery is rated at?
24v and 43 amp hours
The main battery is rated at?
24v and 17 amp hours
TRU 1 normally supplies which bus?
DC BUS 1
TRU 2 normally supplies ?
DC Bus 2 and DC UTIL Bus
ESS TRU 1 and ESS TRU 2 normally supplies?
DC ESS BUS
The ADG supplies AC power to?
3B hydraulic pump
ESS AC BUS
The Main battery is kept in a charged condition by a charger that is powered from which bus?
AC Bus 1
The APU battery is kept in a charged condition by a charger that is powered from which bus?
AC Service Bus
The IDG provides a means of converting
variable engine speed to a contant generator speed of 12,000 rpm
Fault protection for each generator is provided by?
Generator Control Units (GCU's)
The priority for allowing power to AC Bus 1 would be?
IDG 2(GEN 2) normally powers:
AC Bus 2
Each TRU is rated for how much current?
Which DC Bus ties have automatic operation?
TRU CONTACTOR CONTROL
ESS TRU TRANSFER
The ADG will auto deploy when?
AC Bus 1 and AC Bus 2 falls below 50 volts
weight on wheels system indicates aircraft is airborne
Any aircraft generators were online for at least 3.45 seconds prior to the loss of power on AC Buses 1 and 2
An Amber IDG fault light / caution light indicates?
Low IDG oil pressure and / or high IDG oil temp
An AUTO XFER fail light(amber) on the Electrical panel indicates:
Generator over current or a bus fault
An AC ESS XFER light(white) on the Electrical panel indicates:
AC Bus 1 is no longer powering the AC ESSENTIAL Bus
What happens when you switch on the DC SERVICE switch?
With no AC power, the SERV BUS is powered directly from the APU BATT DIR BUS via the service bus contactor
SERVICE CONFIGURATION message appears on DC synoptic page
Service bus contactor not represented on the DC synoptic page
What happens when you turn on the Battery Master switch?
Connects the main battery to the battery bus through the main battery direct bus
Connects the APU battery to the battery bus throught the APU battery direct bus
With the Battery Master switch left on, is there anything you should be concerned about?
Yes, the CRT displays have a 5 minute limitation of being left on without the AC system providing power to the cooling fans
You can run down the Main and APU batteries if left on too long
How many DC buses does the CRJ have?
9 buses in total
DC EMER BUS not shown
What happens when TRU 1 fails?
Main Tie contactor automatically closes
TRU 2 powers DC BUS 1
DC UTIL BUS is load shed(turned off)
Status Messages saying TRU 1 has failed and Main Tie has closed
What happens when TRU 1 and TRU 2 fail?
DC MAIN TIE and CROSS TIE automatically close
ESS TRU 2 powers DC BUS 1, DC BUS 2 and DC SERV BUS
DC UTIL BUS is unpowered
Status messages saying MAIN and Cross TIE's have closed and TRU 1, 2 failed
What happens when ESS TRU 1 fails?
DC ESS TIE automatically closes allowing ESS TRU 2 to power the DC ESS BUS
DC ESS TIE CLSD status message displayed
Which DC Bus Tie does not have automatic operation?
Service Bus Contactor
- It gets activated by the DC SERVICE switch on the Overhead when there is no AC power on the airplane
What are the nine DC buses?